33021121221 has 24 divisors (see below), whose sum is σ = 52235786304. Its totient is φ = 19934914560.

The previous prime is 33021121129. The next prime is 33021121223. The reversal of 33021121221 is 12212112033.

33021121221 is a `hidden beast` number, since 330 + 2 + 112 + 1 + 221 = 666.

It is not a de Polignac number, because 33021121221 - 2⁹ = 33021120709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 33021121194 and 33021121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33021121223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 623481 + ... + 674366.

It is an arithmetic number, because the mean of its divisors is an integer number (2176491096).

Almost surely, 2^33021121221 is an apocalyptic number.

It is an amenable number.

33021121221 is a deficient number, since it is larger than the sum of its proper divisors (19214665083).

33021121221 is a wasteful number, since it uses less digits than its factorization.

33021121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298121 (or 1298118 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 33021121221 its reverse (12212112033), we get a palindrome (45233233254).

The spelling of 33021121221 in words is "thirty-three billion, twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".